Throwing something of sentimental value out the window of a moving car. Usually this item's time has passed, its broke, or it is used up. Items often given the viking burial include empty lighters, broken bowls, small pets, and electronics.

Dude 1: Dude, this lighter is dead.
Dude 2: What? Really? Well, that was my favorite Bic with the poker chips on it. Fuck it give it the viking burial.
Dude 1: (Chucks lighter out window on the interstate)